Wear and Corrosion Resistance of FeCoCrxNiAl High-Entropy Alloy Coatings Fabricated by Laser Cladding on Q345 Welded Joint
Abstract
:1. Introduction
2. Materials and Methods
3. Results
3.1. Effect of Cr Contents on the Corrosion Resistance of FeCoCrxNiAl HEA Coatings
3.1.1. Macro Morphology
3.1.2. Microstructure
3.1.3. Phase Transformation
3.2. Effect of Cr Content on Mechanical Properties of HEA Coatings
3.2.1. Microhardness
3.2.2. Wear Resistance
3.3. Effect of Cr Content on Corrosion Resistance of HEA Coatings
3.3.1. Electrochemical Corrosion Resistance
3.3.2. Corrosion Resistance of HEA Layers in Simulated Marine Atmospheric Environment
3.4. Comparative Study on Corrosion Resistance Improvement in Different Areas of Welded Joint
4. Conclusions
- (1)
- The layer has the good metallurgical bonding with plate, with no obvious defects in the cross section of the cladding layer. The increase of Cr element can promote the formation of BCC phase in the HEA layer contributing to the improvement of hardness and wear resistance.
- (2)
- In the electrochemical corrosion test, the corrosion potential of the cladding layers increases at first and then decreases with the increase of Cr content in the powder, while the self-corrosion current displays the opposite trend. According to the results of neutral salt spray experiment, the corrosion resistance shows the same tendency as the above-mentioned with the increase of Cr content, and the corrosion degree is the lightest when x = 1.5. Due to the different dilution rate, the actual Cr content in the layers is different from the theoretical value. With the increase of the actual Cr content, the corrosion resistance is enhanced.
- (3)
- Laser cladding of FeCoCrxNiAl HEA on the surfaces of welded joint and the electrochemical corrosion test are carried out to explore the enhancing effect of cladding layers on different regions of welded joint. The protective efficiencies on the WB, HAZ and BM are 99.1, 98.4 and 96.6%, respectively. In the neutral salt spray test, compared with the layers, the corrosion degree of welded joint is more serious, and the corrosion products are basically iron oxides. While the corrosion products of the cladding layers are iron oxides and a small amount of Co, Cr, Ni and Al oxides.
- (1)
- In order to further study the corrosion resistance of high entropy alloy repair layer, the corrosion behavior in corrosive environment at different time can be considered in the future study.
- (2)
- In this paper, the composition ratio of high-entropy alloy powder is designed to study the corrosion resistance of the repair layer. Subsequently, the effects of different laser power, scanning speed and different powder feeding amount on the corrosion resistance of the repair layer can be considered.
- (3)
- This paper mainly uses experimental methods to study the corrosion resistance of high-entropy alloy repair layer. The following work can be focused on the software used to simulate the corrosion behavior of repair layer.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Heat Source | Current (a) | Voltage (V) | Welding Gap (mm) | Wire Extension (mm) | Protective Gas Flow Rate (L/min) |
---|---|---|---|---|---|
MIG | 205 | 23 | 1 | 12 | 20 |
No. | Composition | Fe | Co | Cr | Ni | Al |
---|---|---|---|---|---|---|
1 | FeCoCrNiAl | 20 | 20 | 20 | 20 | 20 |
2 | FeCoCr1.5NiAl | 18.2 | 18.2 | 27.2 | 18.2 | 18.2 |
3 | FeCoCr2NiAl | 16.7 | 16.7 | 33.2 | 16.7 | 16.7 |
Heat Source | Laser Power (KW) | Scanning Speed (mm/s) | Powder Feeding (r/min) | Protective Gas Flow Rate (L/min) |
---|---|---|---|---|
Laser | 1000 | 4 | 0.4 | 20 |
Cr Content | Fe | Co | Cr | Ni | Al |
---|---|---|---|---|---|
x = 1 | 44.34 | 13.68 | 17.67 | 15.14 | 9.17 |
x = 1.5 | 28.49 | 17.90 | 24.24 | 17.54 | 11.83 |
x = 2 | 52.94 | 10.18 | 20.83 | 9.35 | 6.70 |
Cr Content | Ecorr (V) | Icorr (A/cm2) |
---|---|---|
x = 1 | −0.485 | 1.297 × 10−5 |
x = 1.5 | −0.297 | 2.567 × 10−6 |
x = 2 | −0.423 | 6.983 × 10−6 |
Cr Content | Fe | Co | Cr | Ni | Al | O | Na | Cl |
---|---|---|---|---|---|---|---|---|
x = 1 | 43.78 | 3.58 | 4.9 | 3.59 | 2.75 | 38.67 | 1.59 | 1.14 |
x = 1.5 | 33.03 | 3.65 | 8.91 | 3.81 | 3.92 | 37.48 | 4.51 | 4.69 |
x = 2 | 40.93 | 2.81 | 5.05 | 2.83 | 2.77 | 38.54 | 3.76 | 3.31 |
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Ben, Q.; Zhang, Y.; Sun, L.; Wang, L.; Wang, Y.; Zhan, X. Wear and Corrosion Resistance of FeCoCrxNiAl High-Entropy Alloy Coatings Fabricated by Laser Cladding on Q345 Welded Joint. Metals 2022, 12, 1428. https://doi.org/10.3390/met12091428
Ben Q, Zhang Y, Sun L, Wang L, Wang Y, Zhan X. Wear and Corrosion Resistance of FeCoCrxNiAl High-Entropy Alloy Coatings Fabricated by Laser Cladding on Q345 Welded Joint. Metals. 2022; 12(9):1428. https://doi.org/10.3390/met12091428
Chicago/Turabian StyleBen, Qiang, Yumeng Zhang, Longxiang Sun, Leilei Wang, Yanni Wang, and Xiaohong Zhan. 2022. "Wear and Corrosion Resistance of FeCoCrxNiAl High-Entropy Alloy Coatings Fabricated by Laser Cladding on Q345 Welded Joint" Metals 12, no. 9: 1428. https://doi.org/10.3390/met12091428